stdenvAdapters.useLibsFrom: init

      });

    });

  useLibsFrom = modelStdenv: targetStdenv:

    let

      ccForLibs = modelStdenv.cc.cc;

      cc = pkgs.wrapCCWith {

        /* NOTE: cc.cc is the unwrapped compiler. Should we respect the old

         * wrapper instead? */

        cc = targetStdenv.cc.cc;

        /* NOTE(originally by rrbutani):

         * Normally the `useCcForLibs`/`gccForLibs` mechanism is used to get a

         * clang based `cc` to use `libstdc++` (from gcc).

         *

         * Here we (ab)use it to use a `libstdc++` from a different `gcc` than our

         * `cc`.

         *

         * Note that this does not inhibit our `cc`'s lib dir from being added to

         * cflags/ldflags (see `cc_solib` in `cc-wrapper`) but this is okay: our

         * `gccForLibs`'s paths should take precedence. */

        useCcForLibs = true;

        gccForLibs = ccForLibs;

      };

    in

    overrideCC targetStdenv cc;

  useMoldLinker = stdenv: let

    bintools = stdenv.cc.bintools.override {

      extraBuildCommands = ''